Lung Nodules - Differential Diagnosis by Distribution • Centrilobular: Hypersensitivity Pneumonitis, RB-ILD, Pneumoconiosis, Infectious Bronchiolitis, Vasculitis, Diffuse panbronchiolitis • Perilymphatic: Sarcoidosis, Silicosis, Amyloidosis, LIP, Lymphangitis Carcinomatosis • Random: Metastasis, Infectious (viral, TB, fungal), Septic emboli, LCH BWH Medicine Chiefs @BrighamChiefs #Lung #Nodules #Differential #Diagnosis #Distribution #pulmonary